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采用KOH活化高温裂解的菠菜叶,制得分级孔活性炭。低温氮气吸脱附表明利用KOH活化所制活性炭材料含有微孔、介孔和大孔,且比表面积高达2616m2/g。FE-SEM和FTIR表明,分级孔活性炭呈颗粒状,且表面含有富氧官能团。采用循环伏安(CV)、恒流充放电(GCD)和电化学阻抗谱(EIS)等测试技术,对分级孔活性炭进行电化学性能表征。在三电极测试体系中,分级孔活性炭在CV曲线中呈现良好矩形特征的双电层电容行为;在充放电电流密度为1A/g下,其比电容值为238 F/g。利用该分级孔活性炭所组装的水系对称双电层电容器,其电压可达到1.2 V,同时具有可观的能量密度,较高的放电倍率及良好的电化学充放电稳定性。
KOH activated pyrolysis of spinach leaves, graded pore activated carbon. Low temperature nitrogen adsorption and desorption indicates that the activated carbon material prepared by KOH activation contains micropores, mesopores and macropores and has a specific surface area of up to 2616 m2 / g. FE-SEM and FTIR showed that graded pore activated carbon was granular and had oxygen-rich functional groups on the surface. The cyclic voltammetry (CV), constant current charge and discharge (GCD) and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical performance of graded pore activated carbon. In the three-electrode test system, the graded-hole activated carbon exhibited a good rectangular characteristic of the electrical double layer behavior in the CV curve; its specific capacitance was 238 F / g at a charge / discharge current density of 1 A / g. The water-based symmetrical electric double layer capacitor assembled by the graded pore activated carbon can reach a voltage of 1.2 V, and has considerable energy density, high discharge rate and good electrochemical charge-discharge stability.